AffineNormalizer( S )
returns the affine normalizer of the space group S. The affine
normalizer contains the translation normalizer as a subgroup. Similarly
as with TranslationNormalizer, the subgroup C of continuous
translations, which is not finitely generated, is not part of the group
that is returned. However, a basis of the space of continuous
translations is bound in the component continuousTranslations.
At present, this function is available only for for space groups, not for
general CrystGroups. Moreover, the NormalizerGL (see NormalizerGL)
of the point group of S must be know, which currently is the case only
for CrystGroups extracted from the space group library.
GAP 3.4.4